@conference {40614,
	title = {Selection for or against facial eczema susceptibility in sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {54},
	year = {1994},
	month = {Jan},
	pages = {263-266},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Facial Eczema (FE) in sheep is associated with liver damage and  
considerable production losses.  Romney flocks, resistant (R) and susceptible  
(S) to FE were established at Ruakura in 1975; a control (C) and a second  
resistant (R2) flock were added after 1981, the R and R2 flocks were  
merged in 1988, and three flocks (R, C, and S) still exist.  Progeny testing  
was carried out in early years for ram selection, and performance testing was  
used after 1981.  The R flock was dosed with sporidesmin in most years since  
1981 at 0.15 mg/kg live weight, with the dose rate for the S flock initially  
0.066 mg/kg and now reduced to 0.04 mg/kg.  The C flock was divided into two  
groups, with one group dosed at 0.15 and one at 0.04 mg/kg, to provide an  
indirect comparison of the R and S flocks.  Blood samples were taken after  
dosing to monitor liver damage via plasma gamma-glutamyltransferase (GGT)  
concentration.  Loge GGT levels increase in proportion to increasing severity  
of liver damage.  Thus, changes in mean loge GGT value reflect changes in  
relative susceptibility or resistance, with negative changes indicating  
increasing resistance. 
 
Two distinct peaks appear in the loge GGT distribution, centred around values  
of about 40 and 500 international units (i.u./l) for both the R and S flocks.  The  
selection flocks differ in the proportions of animals at each peak, suggesting  
that the R and S flocks may be indirectly compared via the C flock although  
different dose rates were used.  Annual divergence in loge GGT in the R flock  
relative to the C flock was -0.081{\textpm}0.047 i.u./l, and the R-flock difference from  
control in the most recent years averaged -1.24{\textpm}0.14 i.u./l.  Divergence of the  
S flock from the C flock was more variable from year to year and the S-flock  
difference from control for the last 6 years averaged 0.48{\textpm}0.11 i.u./l. 
 
A total of 101 industry flocks have used the commercial FE testing service,  
Ramguard, with 9 of them testing for at least 10 years.  A comparison with the  
Ruakura R-flock response was obtained from one such flock selecting for  
production traits and FE resistance since 1979.  Their GGT trend was 34\% of  
the R-flock trend, indicating that less but worthwhile genetic progress has been  
obtained from using a selection programme with a multiple objective. },
	issn = {1176-5283},
	author = {Morris CA and Towers NR and Wesselink C and Wheeler M}
}
@conference {40106,
	title = {Ovulation rates in ewes selected for resistance to facial eczema and the effect of exposure to zearalenone},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {48},
	year = {1988},
	month = {Jan},
	pages = {135-138},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Three mobs of mixed age Saanen milking does (n=15) were grazed separately on 3 suites of paddocks during the spring-summer lactation season between 1984 and 1985. Animals within mobs were drenched at 21 d intervals according to manufacturer{\textquoteright}s recommended dose rates with 1 of either ivermectin, oxfendazole or morantel. Ivermectin was given to all stock while not lactating. Seasonal patterns in faecal nematode egg count (FEC) were similar across all 3 groups. FEC regain measured 7 d after drenching suggested that effectiveness of the drench depended on the type used. Faecal cultures indicated that Ostertagia spp. and Trichostrongylus spp. were dominant during the summer months. Does with kids at foot were turned out for 76 d as tracers on the various suites at the end of the first trial. At slaughter, the dominant genus found was Ostertagia while appreciably fewer Trichostrongylus spp. were recovered. Significant differences in total worm burdens were detected between treatment groups. Drenching programmes appeared to have little effect on parasite control on pasture grazed solely by Saanen does. This is attributable to contamination established on pasture as well as the relative ineffectiveness of these types of drenches in this breed of goat when used at rates recommended for sheep.},
	issn = {1176-5283},
	author = {Smith JF and Campbell AG and Towers NR and Cow NR and McGowan LT and Wesselink C}
}
@conference {39747,
	title = {Breeding for facial eczema resistance - A progress report},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {41},
	year = {1981},
	month = {Jan},
	pages = {273-278},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Campbell AG and Meyer HH and Henderson HV and Wesselink C}
}
